condition mean min max ZT0-3 3.5177225 3.4485200000000003 3.586925 ZT4-7 2.22486 2.22486 2.22486 ZT8-11 2.66433 2.66433 2.66433 ZT12-15 0 0 0 ZT16-19 3.756105 3.756105 3.756105 ZT20-23 4.4969 4.4969 4.4969